29 July 2016 Flat-fielding strategy for the JWST/NIRSpec multi-object spectrograph
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Abstract
The Near-Infrared Spectrograph (NIRSpec) onboard the James Webb Space Telescope (JWST) will be the first space-borne Multi-Object Spectrograph (MOS), comprising a quarter of a million individually addressable microshutters to allow simultaneous observation of ∼100 targets. We present the strategy for flat-fielding the NIRSpec MOS, correcting for the combined effects of the telescope and instrument throughput as well as the detector response. With a highly configurable shutter array, a novel approach is required to ensure that flat- field reference observations do not significantly impact telescope efficiency. We envisage a two-step strategy: 1) Creation of a three-dimensional master flat-field reference (two spatial dimensions, one wavelength) from a small set of well-designed calibration data; 2) Correction of any data frame using a two-dimensional flat-field generated on-the-fly, for that specific MOS configuration, from the master.
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T. D. Rawle, T. D. Rawle, C. Alves de Oliveira, C. Alves de Oliveira, S. M. Birkmann, S. M. Birkmann, T. Boeker, T. Boeker, G. de Marchi, G. de Marchi, P. Ferruit, P. Ferruit, G. Giardino, G. Giardino, N. Luetzgendorf, N. Luetzgendorf, M. Sirianni, M. Sirianni, } "Flat-fielding strategy for the JWST/NIRSpec multi-object spectrograph", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990446 (29 July 2016); doi: 10.1117/12.2232150; https://doi.org/10.1117/12.2232150
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